Update example-drag.mdx (testing-library#1051)

Author: olejech

docs/example-drag.mdx

@@ -17,7 +17,7 @@ await drag(slider, {
 })
 ```
 
-# Kapture
+# Capture
 
 ![slider-testing-lib](https://user-images.githubusercontent.com/880132/80156530-0efc8f00-85bc-11ea-902c-c4e0f11a2579.gif)